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a)A=(-123) - 77 + (-257) +23 - 43 b)B=48+| 48-174|+(-74)
A=[(-123) - 77]+[(-257)-43]+23 B=48+(174-48)+(-74)
A= -200+(-300)+23 B=48+174+(-48)+(-74)
A= -500+23 B=[48+(-48)]+[174+(-74)]
A= -477 B=0+100=100
c)C= -2012+(-596)+(-201)+496+301 d)D=1+2-3-4+5+6-7-8+............-79-80-81
C= -2012+[(-596)+496]+[(-201)+301] D=1+(2-3-4+5)+(6-7-8+9)+............+(78-79-80-81)
C= -2010+(-100)+100 D=1+0+0+............+(-162)
C= -2010+0 D=1+(-162)
C= -2010 D= -161
![](https://rs.olm.vn/images/avt/0.png?1311)
`a)-67.(1-301)-301.67`
`=67.(-1).(-300)-301.67`
`=67.300-301.67`
`=67.(300-301)`
`=67.(-1)`
`=-67`
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`b)(-3879-3879-3879-3879).(-25)`
`=3879.(-4).(-25)`
`=3879.100`
`=387900`
![](https://rs.olm.vn/images/avt/0.png?1311)
a)A=(-123) - 77 + (-257) +23 - 43 b)B=48+| 48-174|+(-74)
A=[(-123) - 77]+[(-257)-43]+23 B=48+(174-48)+(-74)
A= -200+(-300)+23 B=48+174+(-48)+(-74)
A= -500+23 B=[48+(-48)]+[174+(-74)]
A= -477 B=0+100=100
c)C= -2012+(-596)+(-201)+496+301 d)D=1+2-3-4+5+6-7-8+............-79-80-81
C= -2012+[(-596)+496]+[(-201)+301] D=1+(2-3-4+5)+(6-7-8+9)+............+(78-79-80-81)
C= -2010+(-100)+100 D=1+0+0+............+(-162)
C= -2010+0 D=1+(-162)
C= -2010 D= -161
![](https://rs.olm.vn/images/avt/0.png?1311)
( -67 ) . ( 1 - 301 ) - 301 . 67
= ( -67 ) . ( - 300 ) - 301. 67
= 67 . 300 - 301 . 67
= 67 . ( 300 - 301 )
= 67 . ( -1 )
= -67
\(\left(-67\right).\left(1-301\right)-301.67\)
\(=\left(-67\right).\left(-300\right)-20167\)
\(=20100-20167\)
\(=-67\)
![](https://rs.olm.vn/images/avt/0.png?1311)
(-67).(1 – 301 ) – 301. 67 = (-67).1 + 67.301 – 67. 301 = -67
![](https://rs.olm.vn/images/avt/0.png?1311)
8-(x-2017)+(2x-301)=2017-301+5
=>8-x+2017+2x-301=2017-301+5
=>8-x+2x=2017-2017-301+301+5
=>8-x+2x=5
=>-x+2x=8-5
=>x=3
vậy x=3
8-x+2017+2x-301=2017-301+5
-x+2x=2017-301+5-8-2017+301
-3x=-3
x=-3:-3
x=1
sai thì thôi nha
2